PSW-002 User Manual - General Photonics!
Contents
1. Maximum switching rate 1kHz 1 ms per output state2. polarization mode dispersion PMD monitoring coherent optical communications and other polarization related applications Figure 1 PSVV 002 polarization svvitch 1 1 Principle of Operation The PSVV 002 performs polarization state transformations on a signal traveling in optical fiber Using Poincare sphere representation the PSVV 002 transforms the input polarization state along the equi ellipticity contours that are represented by latitude lines The 90 and 45 PSVV 002 devices rotate the polarization state by a half 1 2 circle or quarter circle 1 4 circle respectively along the latitude line on which the input polarization state falls Figure 2a shows the two output SOPs of a 90 PSW resulting from different input polarization states In the first case the input SOP is linear on the equator the two output SOPs will be 180 apart on the circle defined by the equator points and B in the diagram In the second case the input SOP is elliptical the two output SOPs points C and D will be 180 apart on a smaller circle corresponding to the latitude line on which the input SOP falls If the input polarization state is circular north or south poles of the sphere the latitude circle collapses to a point so the output SOP will still be circular Figure 2b shows a similar example for a 45 PSVV 002 In this case points A and B and points C and D are 90 from each other on their respective circles PSW 002 User Guid
3. Examples of basic driver setups A function generator can be used to drive the PSW for periodic svvitching while a DC power supply may be sufficient for occasional svvitching Note that this diagram shovvs only svvitching voltages Once the device has svvitched state the voltage can be lovvered to the latching voltage to maintain the output state PSW 002 User Guide Section 4 0 Specifications Optical Operating Wavelength 1550 30nm or 1310 30nm Polarization Rotation b at 23 C 45 0 5 or 90 0 5 Polarization Rotation all wavelengths all temps 5 Rotation Angle Temperature 0 1 degree C for 45 version Dependence 0 2 degree C for 90 version Note Values referenced vvithout connectors 1 Both output states of 90 PM PSVV with input polarizer at 23 C Switching Time 100 ps typical Electrical Svvitching Current lt 130 mA Latching Voltage 1 502 V Physical and Environmental Fiber Type PM Panda SMF 28 or compatible Operating temperature C to 50 C Storage temperature 40 C to 85 C EES Weight 30g typical including connectors PSW 002 User Guide WARRANTY All of General Photonics products have been inspected and found to comply with our quality assurance standards before shipping If any damage occurs during shipment please contact the carrier and inform us or your distributor as soon as possible Do not attempt repair of any General Photonics product Re
4. Making Light Work Lighter I Ganaral Bhafan rc D we BR RR ou D W We r RR ge VAE E RR UWE 1 C p Ta t 160 PSVV 002 Fiber Optic Polarization Switch User Guide Version 1 0 Date May 30 2014 PSW 002 User Guide General Photonics Incorporated is located in Chino California For more information visit the company s website at VVVVVV generalphotonics com or call 909 590 5473 PSW 002 User Guide SAFETY CONSIDERATIONS The following safety precautions must be observed during operation of this product Failure to comply with these precautions or with specific warnings elsewhere in this manual violates safety standards of design manufacture and intended use of the product General Photonics assumes no liability for customers failure to comply with these requirements Before operation the user should inspect the product and review the manual carefully Use only in a safe work environment in terms of temperature humidity electrical power and risk of fire or shock The product is designed for indoor use Avoid exposure to liquids or water condensation Provide adequate ventilation for cooling Operate the product on a stable surface Avoid excess vibration Standard laser safety procedures should be followed during operation Never look into the light source fiber connector when the light source is turned on THE OUTPUT LIGHT FROM A HIGH POWER LASER I S HARMFUL TO HUMAN EYES Follow industry stand
5. ails Figure 3 shows the input output pigtails for the PSW 002 For devices with SM fiber pigtails the input and output pigtails are interchangeable Devices with PM fiber pigtails should be used with the designated input output configuration There is also an option to add a slow axis aligned polarizer at the PSW input port to improve output PER and rotation angle accuracy Devices with the polarizer included will not work as a polarization switch if the pigtails are reversed Fiber connectors can be FC PC FC APC SC PC or SC APC per customer specification Before each connection fiber connectors should be cleaned using industry standard fiber connector cleaning methods For PM pigtailed PSVV 002s the input connector alignment is also very important For devices vvithout an input polarizer any connector misalignment to the input connector can affect output PER and rotation angle accuracy Fiber pigtails should be handled carefully Excessive force on fiber pigtails may degrade performance or damage the device 2 2 Electrical Features The PSVV 002 requires a bipolar electrical current to perform polarization state svvitching VVithout a drive current the PSVV 002 vvill not rotate the input polarization state and its insertion loss will be slightly higher In laboratory applications the PSVV 002 can be driven by a function generator or a DC power supply The PSVV 002 has two electrical connection pins for the electrical control signals Its e
6. ard procedures when operating a high power laser source PSW 002 User Guide PSVV 002 User Guide Section 1 0 OvervieW sca sxcccncaansacxaccndacsnanaddanaaswcacsaaanaocsanawesaxnancis 7 1 1 Principle of Operation s ENEE 7 Section 2 0 Features 9 2 1 Optical Features a an 9 2 2 Electrical Features una gek brenge ann ana 9 2 3 Switch Timing naar 11 2 4 Dimensions and Mounting Holes 12 Section 3 0 Operation Instructions 13 3 3 UNPACKING ua 13 3 2 Operation nr 13 Section 4 0 Specifications LARA ARAR 14 EN H L Appendix 1 0 Driver Board Optional 16 Driver Board Specifications 16 PSW 002 User Guide PSW 002 User Guide Section 1 0 Overview The PSW 002 is a miniature polarization switch that rotates the input polarization state by a fixed angle either 45 or 909 It is available with either single mode SM fiber or polarization maintaining PM fiber pigtails The switching of the polarization state is achieved using an external control current supply The PSW 002 is compact and can be mounted on a PCB Applications include polarization diversified detectors and sensors polarization multiplexing polarization modulation polarization metrology
7. e 90 PSW 45 PSW Figure 2 Examples of Poincar sphere representations of output polarization states of 90 and 45 PSVV 002s for 2 different cases Case 1 Linear input SOP output states A and B Case 2 Elliptical input SOP output states C and D Please note that the rotation angle with respect to the 53 axis is generally not the same as the solid angle with respect to the origin of the sphere unless the rotation is on the equator 53 0 In Figure 2b both sets of output states points A and B and points C and D are rotated 90 from each other with respect to the S3 axis however the solid angle between points C and D with respect to the origin of the sphere is not 90 Instead it is some angle a whose value depends on the S coordinate of the input SOP For a PSW 002 with PM fiber pigtails an input state aligned to either the slow or fast axis of the input fiber will result in a polarization transformation on the equator of the Poincar sphere With a slow axis aligned input a 90 PM PSW 002 switches the output polarization state between alignment with the slow and fast axes of the output PM fiber With a slow axis aligned input a 45 PM PSW switches the state of its output light between slow axis aligned and 45 from the slow axis at the point where it launches into the output PM fiber PSW 002 User Guide Section 2 0 Features 2 1 Optical Features output input Figure 3 PSW 002 input and output pigt
8. lectrical equivalent circuit is shown in Figure 4 where L is an inductor and Re s a resistor PSW 002 User Guide Figure 4 PSW 002 equivalent electrical circuit Voltage Current Guidelines The PSW 002 requires a certain level of current and voltage to switch from one output state to another switching voltage current but once it has switched it can maintain its state with a lower voltage current latching voltage current Voltage Current A typical drive signal might look like Figure 5 Drive signal diagram Vs switching voltage V latching voltage Ts time switching voltage is applied Lowering the control voltage to the latching voltage to maintain the current output state improves the stability of the output state because it reduces device heating which can affect the rotation angle It is generally recommended to use a drive signal pattern like the one shown in Figure 5 especially if the PSVV 002 is to remain in one state or the other for relatively long periods of time PSVV 002 User Guide 2 3 Suvitch Timing A typical svvitching response is shown in Figure 6 where the upper trace is the synchronization output vvaveform from a function generator and the lovver trace is the PSVV 002 output power after a polarizer A function generator with output voltage set at 2V is used as the PSVV 002 driver The time scale horizontal axis is 50 us division As shown in Figure 6 when a step function vvaveform v
9. oltage is applied to the PSVV 002 there is an initial delay of 75 us The rise time 10 90 of the switch is also on the order of a few 10s of us The total switching time is 100us Figure 6 Svvitching speed of PSVV 002 under a 2 to 2V voltage step PSVV 002 User Guide 2 4 Dimensions and Mounting Holes The PSVV 002 has one mounting hole on its bottom surface between the electrical pins Package dimensions and electrical pin and mounting hole locations are given belovv Electrical pins are 0 5mm in diameter Figure 7 Dimensions and mounting hole information All dimensions given in inches PSW 002 User Guide Section 3 0 Operation Instructions 3 1 Unpacking Inspect PSW 002 for any physical damage due to shipping and transportation Contact carrier if any damage is found Check the packing list to see if any parts or accessories are missing Packing List Electrical cable only for devices with driver board 3 2 Operation Make optical connections For PM PSWs do not reverse input and output connectors 2 Connect the two electrical leads to an electrical driver such as a function generator analog output board or DC power supply as shown schematically in Figure 8 Make sure that the electrical driver is capable of driving an inductive load 3 Power on the driving circuit PSW 002 PSW 002 Function Generator Figure S
10. pair of defective products must be performed by factory trained engineers General Photonics vvarrants that this product vvill be free from defects in materials or vvorkmanship for a period of one year from the date of shipment A product found to be defective during the vvarranty period vvill be repaired or replaced at no charge at General Photonics option If a problem is found please contact General Photonics for assistance and instructions for any necessary returns General Photonics Customer Service T 909 590 5473 Email info generalphotonics com Hwww generalphotonics com The above warranty specifically excludes products that have been repaired or modified by non manufacturer authorized personnel as well as damage caused by misuse abuse improper storage or handling or acts of nature This warranty is in lieu of all other warranties expressed or implied General Photonics will not be liable for any indirect or consequential damages or losses resulting from the use of its products PSW 002 User Guide Appendices Appendix 1 0 Driver Board Optional General Photonics offers an optional driver board to simplify use of the PSVV 002 The board generates the recommended switching latching voltages see Figure 5 allowing the user to control the output state using simple TTL levels Note that the control signal for the board is TTL levels not pulses TTL high output state A TTL low output state B Input out
11. put Figure 9 PSW 002 on driver board Driver Board Specifications LED indicators Drive logic high red and low green EE PSVV 002 User Guide Board Diagram 1 300 622239 Polarization Switch Driver V1 01 U General Photonics Corp 06 29 2012 2 Dimensions in inches Figure 10 PSVV driver board The PSVV driver board has 4 mounting holes located at the corners of the board as shovvn above A 6 pin electrical connector is used to connect the power supply and control signal A connection cable is provided The connector pinout and corresponding connection cable color code are as follovvs Table 1 PSVV driver board cable pinout 3 PS Polarization Logic signal TTL compatible switching Low polarization state A High polarization state B The connection cable is shown below Figure 11 PSW driver board electrical cable PSVV 002 User Guide Setup 1 Connect optical input and output to PSVV 002 2 Connect electrical cable to board 3 Make sure povver supply voltage and current are set at appropriate levels 8 to 15VDC 200 mA 4 Connect control signal Power on power supply Power Supply Control Siqnal Guidelines Power Supply The PSW 002 driver board will accept a power supply voltage anywhere between 8 and 15V but it is generally better to use a lower voltage if possible i e closer to 8V Control Signal Voltage ranges SE Current requirement lt 1HA
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